B2.6 Old and new species

Many things can be learned from fossil record, like history of that fossil (whether its a plant or animal) that lived thousands maybe millions of years ago. Plus it helps compare and contrast how similar and different the species were from millions o

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Why can't scientists be certain about how life began on Earth?

Because there wasn't any evidence, like the fossil record to prove how life began, theories can be made though. Scientists believe that life started with simple single celled organsisms that developed into more complex beings. For example humans.

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How are fossils formed?

Fossils was formed over hundreds of millions of years ago by decomposing plants. After a long period of time, layers and layers of rock, mud, and sand covered the dead plants thousands of feet under the earth, which fossilized them.

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What elements are found in a fossil?

carbon, limestone, water.?

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how can the living organisms cause the extinction of a new species?

Pre existing species can be the cause of a new species extinction, because they have to compete for living resources, e.g water food, so if the new species is weak, they won't be able to survive

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How has the horse evolved over time?

*see image*

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How do massive natural disasters cause extinction?

Natural disasters like earthquakes can disturb species as, habitats may be destroyed, including food sources. If flooding occours the species may drown or food and habitat may be destroyed

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How do the different theories for how the dinosaurs went extinct compare?

A popular theory is the asteroid theory, people believed that, about 65 million years ago a huge collision occoured with either a comet or ateroid and it formed so much dust light couldn't get in, therefore preventing growth of plants - no food

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What environmental changes may cause extinction?

Global warming- if the earth continues to get warmer, by human causes and also natural causes the polar bears habitat will be destroyed, because the ice caps will eventually melt.

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Card 2

Front

Why can't scientists be certain about how life began on Earth?

Back

Because there wasn't any evidence, like the fossil record to prove how life began, theories can be made though. Scientists believe that life started with simple single celled organsisms that developed into more complex beings. For example humans.